Some toxic info spreading over the internet saying that use mklink to redirect the %SystemDrive%\Users folder to some drive/partition else in order for doing less works while reinstalling the system. Infact mklink can't redirect all default system link fully, which causes the filesystem corruption eventually. I'd suffered this painful experience in last few days, those fuuuckees which provide this untested toxic info should go to hell
Thanx for reporting this, and sorry to hear that it messed up your system. Now others will know and won't be burning their fingers like you did.
if you want to use redirection then you are better off using group policy on the local system to do this. Just open up MMC, then add the snap-in Group Policy Object editor, and select local computer. I think it is under user settings.